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G. E. SGRIBNER. ELECTRIC ARO LAMP.

No. 418,757. Patented Jan. '7 1890.

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Patented Jan. 7, 1890.

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O. E. SOR'IBNER. ELECTRIC ARC LAMP.

41 ,757, Patented Jan., '7, 1890.

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UNITED STATES PATENT OFFICE. 7

CHARLES E. SCRIBNER, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE WESTERNELECTRIC COMPANY, OFSAME PLACE.

ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 418,757, dated January7, 1890.

Application filed October 3,1885.

To all whom it may concern:

Be it known that 1, CHARLES E. SCRIBNER, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois,haveinvented a certain new and useful Improvement in Double-Carbon ArcLamps, (Case 100,) of which the following is a full, clear, concise, andexact description, reference being had to the accompanying 1o drawings,formingapart of this specification, My invention relates to electric-arclamps; and it consists in the combination of levers, circuits, andmechanism whereby two sets of carbons may be used, the one after theother, IS in the same lamp, the arc of the second being establishedautomatically immmediately after the arc of the first set isextinguished.

In a prior application, Case 70, Serial No. 116,102, filed December 31,1883, for electric 2o lamps, now pending, I have described and claimedan arc lamp in which the arc is regulated by means of a balanced-levermechanism connected With the clutch which carries the rod. In my presentapplication I have shown the same balanced-lever mechanism in order thatthe action of the lifting and feeding magnets may be exertedindependently to regulate the arc. I have, however, provided differentlevers, which carry the clutches, respectively,

' 3Q of the different sets of carbons and a small magnet of lowresistanceflvhich is brought into circuit with thearc of the first setof carbons and which serves to hold up the lever carrying the clutch of,the second set as long 5 as "the arcbf the first set continues to burn.The holder which carries the two lower carbons consists of two sections,one section being insulated from the other. The section which carriesthe lower carbon of the first set is brought into circuit with the smallmagnet and the arc of the first set when said are is established. Theother section may be connected directly with the line or hook loadingbut. I provide also a cut-out which works 5 automatically to extinguishthe first are when the carbons of the first set are consumed. I Thisautomatic cut-out also serves to cut out the lamp when the carbons ofthe second set are consumed.

My invention is illustrated in the accompanying drawings, in WlllCll-r-Serial No. 178,865. (No model.)

Figure 1 is a side elevation of a doublecarbon arc lamp embodying myinvention,

I certain parts thereof being broken away. Fig.

2 is a view showing the rods and the lovers 5' and clutches foroperating the same. Fig. 3 is a detailed view of one of the side postsor rods and the circuits connected therewith. Fig. 4 is a plan View uponline a a: of Fig. 2. Fig. 5 is a diagram illustrative of the circuits.Fig. 6 is a top viewof the sectional globe-pan. Like parts are indicatedby similar letters of reference throughout the different figures. Asshown in Fig. 1, the lifting-magnet a and the feeding-magneto areconnected with the balanced levers c and d, and the link 6, connectedwith the lever f, is raised and lowered by the action of thefeeding-magnet or the lifting-magnet, as the case may be, independent ofthe action of the other magnet, as described in said pendingapplication. This lever is preferably placed about midway between thetwo carbon-rods and pivoted to the frame at point 9. Lever f is extendedlaterally by the piece h, as shown more clearly in Fig. 4:, said piece hbeing provided with an opening for the carbon-rod 2' of the first set.The lever is is pivoted also at g and carries the clutch of the rod Z ofthe second set. This lever it rests uponthe arm m, projecting So fromthe lever f, while the second arc is burning, but is lifted by theaction of small magnet n, which I term a retaining-magnet, from said armm and held in its elevated po- I sition, so that it will not beoperative as long 8 5 as the first arc continues to burn. The lug or armm in Figs. 1 and 5 is shown about one thirty-second of an inch below thelever 7tthat is to say, the lever is is lifted away from the arm m andheld in this position by the force of the retaining-magnet a, as beforedescribed.

The circuit may be traced, as shown in Fig 5, from the hook o by wire 0,through the lifting-magnet to the frame of the lamp, and 5 thencethrough the carbons of the arc of the first set to the insulated section0 of the carbon-holder, and thence by wire 0 through the small magnet nto the lower contact 0 of the automatic cut-out, and thence by the wire0 to the hook 0. Thus as long as the arc of the first set continues toburn magnetnis IOO included in the circuit, and lever is is held upthereby. Upon the upper end of rod 7; is

provided a collar 1), and under this collar about the rod above the stop1), I preferably place a coiled spring 13 as shown in Fig. 2. As thecarbons of the first set burn away the rod t will descend lower andlower, until finally its descent will be arrested by the stop 19, whenthe rod can descend no farther. The are will then increase until, thelever f continuing to descend, the upper contactpoint of the cut-outcarried by said lever comes against the lower contact 0*. The currentwill thereupon be shunted through the resistance (1 and the arc will beextinguished. The circuit of magnet '11 will thus be broken andnnmediately lever will fall, resting upon the arm on. Thereupon the rodl of the second setwill be fed, bringing the carbons of thesecond settogether. The circuit will thereupon be established, and the currentagain passing through the lifting-magnet, but

not including the small magnet, will cause the second set of carbons tobe separated, so as to establish the second are.

It will be observed that when the current is first sent to the lampthere are two circuits or branches, one of which extends from the hook 0through the lifting-magnet, the frame, the first set of carbons, andsmall magnet n to hook 0, while the other circuit or branch may betraced from said hook 0 to the frame, as before described, and thencethrough the second set of carbons instead of the first, and thence tothe section of the carbon-support which carries the lower carbon of saidsecond set, and thence to the hook o and out. Ive have thus at themoment of starting the two derived circuits, each branch of which passesthrough a different set of carbons. Since the branch through the firstset of carbons includes the small magnet 01, the circuit of the secondset will be broken by the action of said small magnet as soon as it getscurrent. Since lever f is retarded by the dash-pot and lever 7c is freeto move at once, it follows that the second setwill be separated morequickly than the first set, and hence there will be no liability of theare forming first at the second set.

By reference to Figs. 1 and it will. be seen that the line in passesfrom the hook 0 to wire 0, and after passingv through the arc of thefirst set and the insulated section of the support which carries thelower carbon of the first set the circuit continues tothe side rod andby wire 0 through the small eleetro-magnet at, and thence the circuitmay be traced to line out, as before described.

The dash-pot s is of well-known construction. It is connected with thelifting-leverf to retard and steady its motion.

Having thus described my invention, I claim as new and desire to secureby Letters Pate n t- 1. In an electric-arclamp, the combination, withtwo, sets of carbons, of the support divided into insulated sections,one section for each of vthe lower carbons,derived circuits, one througheach of said sets of carbons, and the levers carrying the clutches ofthe different carbon-rods, one of said levers being retarded by adash-pot and the other free to respond to the action of anelectro-magnet, and said electro-magnet and circuits, whereby one set ofcarbons is separated before the other, substantially as and for thepurpose specified.

2. The combination, in an arc lamp, with the carbon-rods 2'1, of theclutches supported by different levers, one of said levers extendingover the arm or portion m of the other lever, the small electro-magnetfor suspending the aforesaid lever above said arm or portion at, themain circuit connected through said magnet while the first are isburning, and switching apparatus for shunting out said are when thecarbons are about consumed and breaking the branch through said magnet,and at the same time closing the circuit through the second set ofcarbons, substantially as and for the purpose specified.

3. In an electric-arc lamp, two sets of earbons, the carbon-rods, andthe clutches supported by different levers, an eleetro-magnet 11,included in the circuit of the arc of the first set for holding thelever suspended, which carries the clutch of the rod of the second setwhile the are of the first set is burning, a stop for arresting thedescent of the rod of the first set when the carbons of the first setare nearly consumed, a shunt-circuit including resistance around the arcof the first set and electro-magnet n, which shunt-circuit is closedautomatically by the descent of the lever which carries the rod of thefirst set as the arc of the first set increases in length after the rodof the first set is arrested by the stop, whereby the are of the firstset is extinguished and the arc of the second set establishedautomatically, substantially as and for the purpose specified.

4. In a double-carbon are lamp, the combination, with the carbon-rods,of two liftinglevers, one of said levers being provided with aretaining-magnet to lift one of the rods out of operation, the saidretaining-magnet being included in thecircuit of the other carbon-rod,whereby one carbon-rod is held out of operation by the retaining-magnetwhen current is flowing through the other carbonrod.

5. The combination, in an electric-arc lamp, with two sets of carbonsand the carbon-rods, of levers 7t and f, for carrying the clutches,

respectively, a retaining electro-magnet, and

mechanism connecting said retaining-magnet with lever k, whereby lever70 may be moved independentlyot lever f, substantially as described.

6. In a double-carbon arc lamp, the combination, with one of theCftlbOl1-lOtIS, of a re taming-magnet and its armature, saidretaining-magnet being included in circuit with the are when the firstset of carbons is burning, and an automatic cut-out for said lamp to IIOshunt out of circuit the said are when such arc becomes abnormallylong,said automatic cut-out in said act of shunting the said are out ofcircuit acting also to shunt outrthe retaining-magnet, saidretaining-magnet on being thus de-energized letting go of the carbonrodof the second set of carbons previously held thereby and prevented fromfeeding to permit the said rod to feed the second set of carbonstogether to establish the second are immediately after theextinguishment of the arc of the first set, substantially as and for thepurpose specified.

7. In a double-carbon arc lamp, a support for the lower carbons,consisting of two insulated sections, one section for each of thecarbons, substantially as and for the purpose specified. I

8. The combination, with the side rod of an arc lamp, of an insulatedpost 0, mounted thereon, the circuit 0, leading from said hook throughthe liftingmagnet, and thence through the circuit, and thence to theside rod, and thence bywire 0 through a small magnet 92 to the contact 0of the cutout, and thence to the other hook 0, substantially asdescribed.

9. In a double-carbon arc lamp, two carbonrods, in combination with thecircuit of the lamp including both of said carbon-rods, aretaining-magnet included in the circuit with one of the carbon-rods tobe energized when current flows through that carbon-rod, and thearmature of said retaining-magnet mechanically connected with the othercarbon-rod to lift the said rod when said retaining-magnetis energized,substantially as and for the purpose specified.

10. In a double-carbon arc lamp, two carbon-rods, the circuit of thelamp including both of said carbon-rods, a retaining-magnet included inthe circuit with one of the carbonrods to be energized when currentflows through that carbon-rod, and the armature of said retaining magnetmechanically c011- nected with the other carbon-rod to lift the said rodwhen said retaining-magnet is energized, in combination with a shuntaround said retainin g-magnet and arc, said shunt including acircuit-closing device controlled by the arc, whereby the said are andretaining-magnet are shunted out of circuit automatically, substantiallyas and for the purpose specified.

11. In a double-carbon electric-arc lamp, two carbon-rods each providedwith clutch mechanism for lifting and feeding the same andelectro-magnetic devices in the main circuit and in the shunt of thearc, in combination with retaining mechanism to carry and hold out ofuse one of said carbon-rods and its clutch mechanism while the othercarbon-rod and its clutch mechanism are carried and fed by the saidelectro-magnetic devices.

In witness whereof Ihereunto subscribe my name this 21st day ofSeptember, A. D. 1885.

CHARLES E. SCRIBN ER.

Witnesses:

GEORGE P. BARTON, F. H. MoCULLocH.

